(256) 
Ecrropot HECIUM AMPHIBOLUM Spruce. 
Near Aten, 1070 meters, on decayed log, Aug. 4, 1902 
(2049). Near Aten, on wet clay, Aug. 3, 1902 (2058). San 
Juan, Rio Asariamas, 1160 meters, March 22, 1902 (2032). 
IsOPTERYGIUM BRACHYNEURON (C. M.) Mitt. 
Charopampa, 480 meters, on bark, Sept. 24, I901 (2056). 
Tumupasa, 430 meters, Jan 25, 1902 (2131). New Brazil, 
June 15, 1902, on bark (2094). Near Aten, on decayed wood 
and earth, 1500 meters, June 17, 1902 (2070). Apolo, on 
decayed wood and earth, 1500 meters, June 29, 1902 (2097). 
IsoPTERYGIUM TENERUM (Sw.) Mitt. 
San Buena Ventura, 190 meters, on bark, Nov. 29, 1901 
(20 Tumupasa, 430 meters, on bark, with Prerogoni- 
ella  pulchella, Jan. 23, 1902 (2059). 
IsoPTERYGIUM LEUCOPHYLLUM (Hampe) Mitt. 
Apolo, 1500 meters, on tree trunk, March 6, 1902 (2068). 
Near Apolo, on tree trunk, Feb. 14, 1902 (2071) 
Plagiothecum mollicaule sp. nov. 
Apparently dioicous: plants in glossy, light-green, soft 
mats with procumbent, slender, scarcely branching stems up 
to 5 cm. long or more and 175 » in diameter, without central 
strand and arind of one row of smaller, thin-walled cells; 
leaves complanate, slightly curved to one side, entire, long- 
decurrent, about 1.25 mm. long and .5 mm. wide, broadly 
ovate-acute with a short-subulate, entire apex, more or less 
recurved on borders, ecostate or bicostate up to one third of 
leaf, with an ill-defined cluster of larger, pale cells at the 
basal angles; median leaf-cells about 6 » wide and up to 80 
pe long; perichaetial leaves from a broad base gradually lan- 
ceolate-pointed, ecostate, entire, convolute with the apex 
mostly spreading ; seta about 1.5 cm. high; capsule erect or 
nodding, oblong, without lid about 1 mm. long, exothecal 
cells near middle of capsule up to 24 4 wide and 30 u long, 
about 3 rows of cells at mouth transversely elongate; lid 
conical apiculate, annulus simple, breaking away in trag- 
ments; peristome teeth pale, striate Seale  papillose above, 
about 50 # wide at base and 320 w high; inner segments of 
equal length, very narrow, solid or slightly split along keel, 
